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onsemi LM2574N-5G
- Part No.:
- LM2574N-5G
- Manufacturer:
- onsemi
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2574N-5G.pdf
- Description:
- IC REG BUCK BOOST 5V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:402
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Product details
Overview
LM2574N-5G from Texas Instruments is a monolithic 0.5-A non-synchronous step-down (buck) DC-DC switching regulator in PDIP-8 package, delivering fixed 5-V output with ±4% tolerance over line and load, 40-V max input voltage, and 52-kHz fixed-frequency operation. It serves as an efficient replacement for linear regulators in industrial power supplies, embedded controllers, and distributed power architectures.
For engineers reviewing the LM2574N-5G datasheet, pinout, applications, or equivalent options, key selection criteria include its 5-V fixed output, 0.5-A continuous load capability, TTL-compatible ON/OFF control, thermal shutdown protection, and minimal external component count (only 4 required).
Technical Context
The LM2574N-5G integrates a PWM controller, power transistor, oscillator, error amplifier, and protection circuitry into a single PDIP-8 IC. Its non-synchronous buck architecture uses an internal NPN switch with 1.2-V saturation voltage at 0.5 A, regulated via feedback from the output to the FB pin (shorted to VOUT in fixed versions).
Operation relies on a fixed 52-kHz oscillator with ±10% tolerance, cycle-by-cycle current limiting (1.0-A typical peak limit), and thermal shutdown. The ON/OFF pin enables TTL-level shutdown with 50-μA standby current, while SIG_GND and PWR_GND pins are separately routed for noise isolation and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5 V ±4% over full temperature and load range - ensures stable logic supply without external resistor divider. |
| Max Output Current | 0.5 A DC - supports microcontroller cores, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 5-V, 12-V, and 24-V industrial rails with margin for transients. |
| Oscillator Frequency | 52 kHz ±10% - enables use of low-cost, high-saturation-current inductors and reduces EMI filtering complexity. |
| Efficiency | 77% at VIN = 12 V, IOUT = 0.5 A - minimizes thermal load on PCB; copper traces suffice as heatsink. |
| Standby Current | 50 μA typical at ON/OFF = HIGH - enables low-power sleep modes in battery-backed systems. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during short-circuit or overload without external sensing. |
Pinout & Package
LM2574N-5G is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 6.35 mm × 9.81 mm body size and through-hole mounting. Thermal resistance RθJA is 60.4°C/W on standard JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Internally connected to output capacitor for fixed 5-V version - no external resistors needed. |
| 2 SIG_GND | Signal ground | Reference for internal bandgap and error amplifier - must tie to clean analog ground plane. |
| 3 ON/OFF | Enable control input | TTL-compatible: ≤1.2 V = ON, ≥2.2 V = OFF - allows microcontroller or logic-level sequencing. |
| 4 PWR_GND | Power ground | High-current return path for switch and input/output capacitors - requires low-inductance connection to bulk ground. |
| 5 VIN | Input supply | Collector of internal NPN switch - accepts up to 40 V; requires local 22-μF electrolytic bypass. |
| 6–8 NC | No connect | Internal die pads with no bond wires - must be soldered to PCB for mechanical stability and thermal conduction. |
| 7 OUTPUT | Switching node | Emitter of internal NPN transistor - connects directly to inductor and catch diode cathode. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed-output configuration | 5-V version eliminates feedback resistor network - reduces BOM count and layout sensitivity. |
| Integrated current limiting | 1.0-A peak switch current limit - protects against short-circuit without external sense resistor or comparator. |
| Thermal shutdown | Activates at ~150°C junction temperature - prevents permanent damage during sustained overload or poor airflow. |
| Low-component design | Only 4 external parts required (inductor, diode, input cap, output cap) - accelerates prototyping and lowers assembly cost. |
| TTL shutdown interface | 50-μA standby current with logic-high disable - enables precise system-level power sequencing in multi-rail designs. |
Applications
| Industrial Power Supply | Embedded Controller Board |
|---|---|
Use Scenario: Converting unregulated 24-V DC rail to stable 5-V supply for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 5-V rail. Use Value: Eliminates need for heat sinks; withstands 40-V transients per IEC 61000-4-4; supports 0.5-A peak loads during relay actuation. | Use Scenario: Powering ARM Cortex-M microcontrollers, SPI peripherals, and ADCs on compact industrial control boards. IC Role / Device Role / Timing Role: Main 5-V system regulator with enable control synchronized to processor reset sequence. Use Value: 50-μA shutdown current extends battery backup runtime; 52-kHz switching avoids audible noise in enclosed enclosures. |
| Automotive Body Control Module | Test & Measurement Equipment |
Use Scenario: Generating 5-V supply from 12-V battery (with load dump protection) for window lift ECUs and lighting drivers. IC Role / Device Role / Timing Role: Pre-regulator feeding low-noise LDOs for analog signal chains and CAN transceivers. Use Value: 40-V input rating handles ISO 7637-2 pulse 1/2/5a; thermal shutdown prevents latch-up during hot-car conditions. | Use Scenario: Providing clean 5-V bias for precision op-amps, reference buffers, and digital isolators in benchtop instruments. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator reducing thermal drift in analog front-ends. Use Value: 77% efficiency at 0.5 A limits self-heating; separate SIG_GND/PWR_GND pins minimize ground bounce in sensitive measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575N-5.0 | Higher 1-A output current; 52-kHz frequency; same PDIP-8 package and pinout. | Supports higher load currents without redesign; requires larger inductor and diode. | Select when >0.5-A load headroom is required and board space allows larger magnetics. |
| MP1584EN-LF-Z | 3-A output; 1.5-MHz switching; SOIC-8 package; requires external compensation. | Enables smaller inductors/caps but increases EMI filtering burden and layout sensitivity. | Select for space-constrained designs where 52-kHz EMI is problematic and higher efficiency at light loads is critical. |
Compared with LM2574N-5G, LM2575N-5.0 offers double the current capacity in identical footprint, while MP1584EN-LF-Z trades simplicity and ruggedness for higher density and frequency - making LM2574N-5G optimal for cost-sensitive, thermally constrained, or transient-heavy 0.5-A applications.
Availability
LM2574N-5G is available at Aetrix Electronics and suitable for industrial power supplies, embedded controller boards, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2574N-5G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in reliable, high-volume power IC design.
The LM2574x SIMPLE SWITCHER® product line was engineered for ease-of-use in cost-sensitive, medium-power DC-DC conversion - prioritizing minimal external components, robust protection, and wide-input-voltage operation in industrial and automotive environments.
FAQ
What is the maximum input voltage rating for LM2574N-5G?
The LM2574N-5G has a maximum input voltage rating of 40 V, as specified in its Absolute Maximum Ratings table. This allows safe operation from nominal 24-V industrial rails and 12-V automotive systems with transient margin. Exceeding 40 V risks permanent damage, and the HV variant (LM2574HV) is required for inputs up to 60 V. The LM2574N-5G datasheet confirms this limit under all operating conditions.
Does LM2574N-5G require an external feedback resistor network?
No, the LM2574N-5G is a fixed-output version with internal feedback set to 5 V. Pin 1 (FB) is internally connected to the output stage and must be shorted directly to the output capacitor - no external resistors are needed. This simplifies design and improves regulation accuracy compared to adjustable variants like LM2574ADJ. The LM2574N-5G datasheet explicitly states this configuration in the Pin Functions and Typical Application sections.
How does the ON/OFF pin function on LM2574N-5G?
The ON/OFF pin (Pin 3) provides TTL-compatible enable control: logic-low (≤1.2 V) enables regulation, while logic-high (≥2.2 V) places LM2574N-5G in low-power shutdown with 50-μA typical quiescent current. It must never be left floating. This feature enables precise power sequencing in multi-rail systems and extends battery life in portable equipment. The LM2574N-5G datasheet defines VIH/VIL thresholds and standby current in Section 6.5.
What thermal considerations apply to LM2574N-5G in PDIP-8 package?
The LM2574N-5G in PDIP-8 has a junction-to-ambient thermal resistance (RθJA) of 60.4°C/W on a standard JEDEC board. At 0.5-A load and 12-V input, dissipation is ~3.5 W, resulting in ~210°C rise - exceeding the 150°C max junction limit. Therefore, PCB copper area acting as heatsink is mandatory. The LM2574N-5G datasheet recommends connecting PWR_GND and NC pins to large ground planes and avoiding thermal isolation.
Can LM2574N-5G be used in a buck-boost (positive-to-negative) configuration?
Yes, the LM2574N-5G can be configured as a positive-to-negative converter (inverting buck-boost) per TI's Application Note SNVA229. In this topology, the OUTPUT pin becomes the negative output node, and the FB pin references ground. Output magnitude remains 5 V, but polarity is inverted. Component selection (inductor, diode, capacitor) differs from buck mode, and efficiency drops ~5–10%. The LM2574N-5G datasheet lists this as a supported application in Section 2.
LM2574N-5G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2574N-5G FAQ
1.How can I place an order for LM2574N-5G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2574N-5G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2574N-5G reliable?
The price and inventory of LM2574N-5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2574N-5G is usually 5 days.
3.What payment methods are accepted for LM2574N-5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2574N-5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2574N-5G?
LM2574N-5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2574N-5G order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2574N-5G?
For technical support, including LM2574N-5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2574N-5G requirements.
6.How does Aetrix verify that LM2574N-5G is sourced from the original manufacturer or authorized distributors?
All LM2574N-5G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2574N-5G meets industry standards.
7.What is the process for return or replacement of LM2574N-5G?
All LM2574N-5G units undergo pre-shipment inspection (PSI). If there is an issue with LM2574N-5G, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2574N-5G part is unused and in its original packaging.
Return procedure for LM2574N-5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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